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<div class="titlepage"><div><div><h3 class="title">
<a name="boost_asio.reference.ConvertibleToConstBuffer"></a><a class="link" href="ConvertibleToConstBuffer.html" title="Convertible to const buffer requirements">Convertible
      to const buffer requirements</a>
</h3></div></div></div>
<p>
        A type that meets the requirements for convertibility to a const buffer must
        meet the requirements of <code class="computeroutput"><span class="identifier">CopyConstructible</span></code>
        types (C++ Std, 20.1.3), and the requirements of <code class="computeroutput"><span class="identifier">Assignable</span></code>
        types (C++ Std, 23.1).
      </p>
<p>
        In the table below, <code class="computeroutput"><span class="identifier">X</span></code> denotes
        a class meeting the requirements for convertibility to a const buffer, <code class="computeroutput"><span class="identifier">a</span></code> and <code class="computeroutput"><span class="identifier">b</span></code>
        denote values of type <code class="computeroutput"><span class="identifier">X</span></code>,
        and <code class="computeroutput"><span class="identifier">u</span></code>, <code class="computeroutput"><span class="identifier">v</span></code>
        and <code class="computeroutput"><span class="identifier">w</span></code> denote identifiers.
      </p>
<div class="table">
<a name="boost_asio.reference.ConvertibleToConstBuffer.t0"></a><p class="title"><b>Table&#160;6.&#160;ConvertibleToConstBuffer requirements</b></p>
<div class="table-contents"><table class="table" summary="ConvertibleToConstBuffer requirements">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                <p>
                  expression
                </p>
              </th>
<th>
                <p>
                  postcondition
                </p>
              </th>
</tr></thead>
<tbody>
<tr>
<td>
                <p>
</p>
<pre class="programlisting"><span class="identifier">const_buffer</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
<span class="identifier">const_buffer</span> <span class="identifier">v</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
</pre>
<p>
                </p>
              </td>
<td>
                <p>
</p>
<pre class="programlisting"><span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">v</span><span class="special">)</span>
  <span class="special">&amp;&amp;</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">v</span><span class="special">)</span>
</pre>
<p>
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
</p>
<pre class="programlisting"><span class="identifier">const_buffer</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
<span class="identifier">const_buffer</span> <span class="identifier">v</span> <span class="special">=</span> <span class="identifier">a</span><span class="special">;</span>
</pre>
<p>
                </p>
              </td>
<td>
                <p>
</p>
<pre class="programlisting"><span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">v</span><span class="special">)</span>
  <span class="special">&amp;&amp;</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">v</span><span class="special">)</span>
</pre>
<p>
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
</p>
<pre class="programlisting"><span class="identifier">const_buffer</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
<span class="identifier">const_buffer</span> <span class="identifier">v</span><span class="special">;</span> <span class="identifier">v</span> <span class="special">=</span> <span class="identifier">a</span><span class="special">;</span>
</pre>
<p>
                </p>
              </td>
<td>
                <p>
</p>
<pre class="programlisting"><span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">v</span><span class="special">)</span>
  <span class="special">&amp;&amp;</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">v</span><span class="special">)</span>
</pre>
<p>
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
</p>
<pre class="programlisting"><span class="identifier">const_buffer</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
<span class="keyword">const</span> <span class="identifier">X</span><span class="special">&amp;</span> <span class="identifier">v</span> <span class="special">=</span> <span class="identifier">a</span><span class="special">;</span>
<span class="identifier">const_buffer</span> <span class="identifier">w</span><span class="special">(</span><span class="identifier">v</span><span class="special">);</span>
</pre>
<p>
                </p>
              </td>
<td>
                <p>
</p>
<pre class="programlisting"><span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">w</span><span class="special">)</span>
  <span class="special">&amp;&amp;</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">w</span><span class="special">)</span>
</pre>
<p>
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
</p>
<pre class="programlisting"><span class="identifier">const_buffer</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
<span class="identifier">X</span> <span class="identifier">v</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
<span class="identifier">const_buffer</span> <span class="identifier">w</span><span class="special">(</span><span class="identifier">v</span><span class="special">);</span>
</pre>
<p>
                </p>
              </td>
<td>
                <p>
</p>
<pre class="programlisting"><span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">w</span><span class="special">)</span>
  <span class="special">&amp;&amp;</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">w</span><span class="special">)</span>
</pre>
<p>
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
</p>
<pre class="programlisting"><span class="identifier">const_buffer</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
<span class="identifier">X</span> <span class="identifier">v</span> <span class="special">=</span> <span class="identifier">a</span><span class="special">;</span>
<span class="identifier">const_buffer</span> <span class="identifier">w</span><span class="special">(</span><span class="identifier">v</span><span class="special">);</span>
</pre>
<p>
                </p>
              </td>
<td>
                <p>
</p>
<pre class="programlisting"><span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">w</span><span class="special">)</span>
  <span class="special">&amp;&amp;</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">w</span><span class="special">)</span>
</pre>
<p>
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
</p>
<pre class="programlisting"><span class="identifier">const_buffer</span> <span class="identifier">u</span><span class="special">(</span><span class="identifier">a</span><span class="special">);</span>
<span class="identifier">X</span> <span class="identifier">v</span><span class="special">(</span><span class="identifier">b</span><span class="special">);</span> <span class="identifier">v</span> <span class="special">=</span> <span class="identifier">a</span><span class="special">;</span>
<span class="identifier">const_buffer</span> <span class="identifier">w</span><span class="special">(</span><span class="identifier">v</span><span class="special">);</span>
</pre>
<p>
                </p>
              </td>
<td>
                <p>
</p>
<pre class="programlisting"><span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_cast</span><span class="special">&lt;</span><span class="keyword">const</span> <span class="keyword">void</span><span class="special">*&gt;(</span><span class="identifier">w</span><span class="special">)</span>
  <span class="special">&amp;&amp;</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">u</span><span class="special">)</span> <span class="special">==</span> <span class="identifier">buffer_size</span><span class="special">(</span><span class="identifier">w</span><span class="special">)</span>
</pre>
<p>
                </p>
              </td>
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</tbody>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2003-2012 Christopher M. Kohlhoff<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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